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Staging Setup
The Viltech controller can be configured to operate on any compressor that performs capacity control in discrete
steps. The Controller supports up to six (6) capacity steps. Each capacity step is configured to energize to unload
(Unloader). Also, each capacity step can be assigned a percentage associated with that level of capacity. A
capacity percentage is also assigned to the fully unloaded position. The staging configuration is accessed from
the configuration menu (MENU >SYSTEM SETUP -> CONFIGURE HARDWARE -> STAGING
CONFIGURATION). To avoid possible damage to the compressor, it is important that the capacity configuration
be setup to match the compressor configuration when the controller is initially installed.
Minimum Capacity
Certain compressors should not operate below a minimum capacity value under normal operations. The compres-
sor starts fully unloaded and then must be staged up to the minimum immediately. Once the compressor has
started and the “Up to Speed” delay has expired, the compressor will be staged up to the minimum capacity
position using the load fast stage delay. Once the minimum capacity has been reached, the compressor will
transition into the running state. Under normal capacity control, the compressor will never unload beyond this
value. Please check the compressor manufactures documentation to verify if this is required for your unit.
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